Historical clue formulations

• Pet pests — 2026-05-05
• Affliction treated with a nit comb — 2026-02-28
• One of the 10 plagues of Egypt — 2025-07-20
• Some epizoa — 2025-03-14
• Some sources of typhus — 2025-02-07
• Head-scratchers? — 2024-04-11
• Problems that come to a head? — 2021-04-21
• Little suckers — 2020-08-09
• Parasitic insects that suck — 2020-06-29
• Evil intent — 2020-03-05
• Head residents? — 2019-11-24
• Whopper — 2019-10-31
• Subject of a school nurse's inspection — 2019-07-16
• Pet peeves? — 2018-06-17
• Canine woe — 2018-05-08
• Big nits — 2016-08-17
• Itchy dog's woe — 2013-04-30
• Dog pests — 2012-09-03
• Some ectoparasites — 2011-05-28
• Cause of head-scratching, perhaps — 2010-06-30
• Pet problem — 2010-04-09
• Woe for Fido — 2010-01-24
• Some creepy-crawlies — 2008-04-28
• Head case? — 2006-12-25
• Woe for Fido — 2006-08-02
• Nits, eventually — 2004-11-03
• Wingless parasites — 2002-10-15
• Vermin — 2002-07-07
• Some ectozoa — 2002-02-15
• Head hunters' targets — 2000-10-15
• Case for a vet — 1996-07-18
• Parasites — 1996-04-23
• Head residents? — 1994-03-12